IMHO, this is just a symptom of what we experience every day in this country. People who are intellectually lazy find it easier to categorize people or groups and then attribute actions / thoughts / beliefs to everyone in those groups. It's also easier to label those groups as "they" or "them", thereby excluding oneself from the group that is subject to criticism or ridicule.
When you become REALLY good at this, you qualify to become a Republican or a Democrat and run for office. Then you can work to persuade everyone who isn't aligned with the opposing group that the opposing group is to be distrusted.